I want to implement Survey functionality in my org to capture customers feedback. I'm currently using Einstein BOTS to capture the customer inputs. 

Current Flow :

1) Survey SMS Sent to Customer (using Process Builder)

2) Customer Replies “Yes” or “No” using their mobile device

3) Einstein BOT listens for “Yes/No” intents (I have created a Einstein BOT with intents)

4) Einstein BOT triggers a flow which then stores the customer feedback in a custom object.

The disadvantage of using Einstein BOT is that, it always listens to customer inputs and if the customer sends "Yes" or "No" SMS anytime, Einstein BOT will be triggered and the flow will run.

Is there any other solution to capture Customer SMS inputs "Yes" or "No" and store in a variable in Salesforce.?